Jonas Salk: It is courage...

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Jonas Salk: It is courage...

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It is courage based on confidence, not daring, and it is confidence based on experience.

Source: On administering the experimental vaccine for polio to himself and his wife and three sons, news summaries 9 May 1955.
-- Jonas Salk, (Oct 28 1914-1995), US microbiologist; He developed the first polio vaccine using dead viruses, 1952-55.

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